Patrons abound but I wanted to try and make new pact options for warlocks. Full disclosure this is my first crack at warlock homebrew!

Pact of the Eye

-Your Patron gifts you a peculiar eye that can aid you in your arcane pursuits. This eye functions as a spell casting focus.

-Additionally, channeling Cantrips or spells through this focus increases the spell’s range by 30ft.



Pact of the Brand

-Your patron leaves their mark burnt into your flesh. You learn the Control Flames cantrip. This does not count against the number of cantrips that you know.

-You gain the ability to see heat, which grants you Darkvision out to 120ft.



Pact of Chimes

-Your Patron grants you a set of chimes enchanted with motes of elemental wind energy. You gain the Gust and Mage Hand cantrips. They do not count against the number of cantrips that you know, and are considered warlock cantrips for you. While these chimes are on your person you can cast these cantrips at will, and your base movement speed increases by 10ft.

-If you lose your chimes, you can perform a 1-hour ceremony to receive a replacement from your patron. This ceremony can be performed during a short or long rest, and it destroys the previous chimes. The chimes blink out of existence when you die.



Pact of the Vial

-Your patron gifts you with a vial of holy water. This grants you the Shape Water cantrip. This does not count against the number of cantrips that you know, and is considered a warlock cantrip for you.

-While you have your vial on your person you have advantage on death saving throws.

-If you lose your vial, you can perform a 1-hour ceremony to receive a replacement from your patron. This ceremony can be performed during a short or long rest, and it destroys the previous vial. The vial evaporates into the air when you die.



Pact of the Gem

-Your patron marks his favor by embedding a precious gem into your body or onto one of your limbs. This grants you the Mold Earth cantrip. This does not count against the number of cantrips that you know, and is considered a warlock cantrip for you.

-If you are knocked prone you may use your reaction to force the ground beneath you to push you into a standing position.

-If your gem is removed, you can perform a 1-hour ceremony to receive a replacement from your patron. This ceremony can be performed during a short or long rest, and it destroys the previous gem. The gem crumbles to dust when you die.

The only way I see to do this would be to replicate whichever subclass you're using and add these in as a subclass feature with the note saying to not make a selection in the class feature Pact Boon.

Almost all of these can be replicated by an Invocation or a feat, and most of them read to me like magic items. Your themes are interesting, but if you look at the existing pact options you will notice that they provide benefits that you can't really get any other way. They also try to embody a deeper connection to how the warlock functions in the world - tome warlocks are seekers of forbidden knowledge, blade warlocks are eldritch warriors, chain warlocks use a magical creature to do their bidding. What do eye warlocks do? Wear glasses?

Dig deeper into the themes and try to find unique mechanics that can illustrate them.

Try something like these. Couldn’t think of anything for the brand or the gem.

Pact of the Eye

-Your Patron gifts you a peculiar eye that can aid you in your arcane pursuits. This eye functions as a spell casting focus for your Warlock spells.

-While you are holding the eye you have proficiency in two of the following skills: Investigation, Arcana, or History. You also have a bonus equal to your charisma modifier when you make an ability check with one of these skills.

-If you lose your eye, you can perform a 1-hour ceremony to receive a replacement from your patron. This ceremony can be performed during a short or long rest, and it destroys the previous eye. The eye blinks out of existence when you die.

Pact of Chimes

-Your Patron grants you a set of chimes enchanted with motes of eldritch energy. You know the Sanctuary and Protection from Evil and Good spells. They do not count against the number of warlock spells you know. You can cast these spells once per long rest without expanding a pact slot.

-If you lose your chimes, you can perform a 1-hour ceremony to receive a replacement from your patron. This ceremony can be performed during a short or long rest, and it destroys the previous chimes. The chimes blink out of existence when you die.



Pact of the Alchemist.

-Your patron gifts you a set of Alchemist Supplies.

•You have proficiency with the Alchemist Supplies.

•You are proficient with the improvised weapons: Alchemist Fire, Acid Flask’s, and Oil Flask’s. You can use your charisma modifier for the attack and damage rolls.

•When you finish a long rest you can craft a number of these equal to your charisma modifier. They last until you finish a long rest. 

-If you lose your Alchemist Supplies, you can perform a 1-hour ceremony to receive a replacement from your patron. This ceremony can be performed during a short or long rest, and it destroys the previous Alchemist Supplies. The Alchemist Supples evaporates into dust when you die.

Cool concepts. As others have previously mentioned, I definitely think they could use some refining. Maybe flesh out one idea at a time before going ham on creating a list of several. I like @optimistic14's optometric suggestions for the pact of the eye; except I might add for the last part, a nice and twisted flavor option would be that instead of performing a ceremony to simply replace the eye, perhaps the warlock would have to present a new eye to become a pact item. 👁