The following ideas are simple enough to create a few for yourself, and lots more for your friends. Test a handful of these tutorials to gift, and get inspired to design your own!
Sewing Key Chain:

Image: parents
Animal Keychain: DIY

Image: etsy
Music Note Key Chain:

Image: etsy
Fabrics Purse Coin Keychain With Plastic Insert:

Image: handmadiya
Great Handprint Keychain:

Image: greyhouseharbor
Wooden Key Fobs: DIY

Image: creaturecomfortsblog
Leather Feather Key Danglers:

Image: lovemaegan
Wine Cork Keychains:

Image: sixdollarfamily
Leather Keychain:

Image: diyinpdx
Men Mini Book Key Chain Tutorial: Gift Idea

Image: diy-enthusiasts
Leather Tassle Keychain:

Image: littlegreennotebook
Leather Tassel Keyring:

Image: lovelyindeed
Fabric Chapstick Holder: Mini Purse

Image: makeit-loveit
Monogrammed Acrylic Keychain With Tassel:

Image: momtastic
Bohemian Rope Tassels Keychain:

Image: madeinaday
Rainbow Buttoned Keychain:

Image: etsy
Sprinkle Donut Keychain:

Image: brandymelvilleusa
Steampunk Driftwood Key/ Bag Chain:

Image: coastalhome.co.uk
Stamped DIY Leather Keychains:

Image: dreamalittlebigger
Prospect Goods Tassel Keychain – Brass Keychains

Image: prospectgoods
Crochet Heart Keychain:

Image: diyhowto.org
Simple Leather Keychain:

Image: littlegreennotebook
LEGO Keychain:

Image: instructables
Be Kind Tassel Keychain:

Image: orangenmond.at
Rainbow Quilling Keychain: Paint Stick Keychain

Image: ruffledblog
Rope Tassel Keychains:

Image: aliceandlois
Fork Peace Sign Keychain:

Image: etsy
Wooden Bead Keychain:

Image: themerrythought
Fabric Key Chain Tutorial:

Image: jedicraftgirl
Rainbow Loom Personalized Keychain:

Image: etsy
Acrylic Keychain:

Image: etsy
Convenient Keychain Key Holder:

Image: handmadiya