From Tiers 1 - 3 they come in 7 variations of color: Sooty Brown, Dark Brown, Light Brown, Pure Brown, Dusky Brown, Dark Grey, and Light Grey.
Can be bought from horse vendors in various cities.
Young: +40 ground speed, +20 stability, required level 10
Untrained: +50 ground speed, +30 stability, required level 20
Trained: +60 ground speed, +40 stability, required level 30
Venerable: +70 ground speed, +50 stability, required level 40
Tier 4 horses come in 9 variations: Light Brown, Brown, Dark Brown, Light Grey, Grey, Black, White, Black and Grey, and Black and White.
Tier 1: 12s, 50c
Tier 2: 3g
Tier 3: 10g
Tier 4: 50g
Camels can be bought in Qalia in the Tauthien Delta zone from Cal Kamelott. He is West of the Tauthien Delta Riftway in an oasis. They start at Tier 2 (required level 20) and are the same stat-wise as horses.
Untrained One Hump Camel or Untrained Two Hump Camel: +50 ground speed, +30 stability, required level 20
Trained One Hump Camel or Trained Two Hump Camel: +60 ground speed, +40 stability, required level 30
Venerable One Hump Camel or Venerable Two Hump Camel: +70 ground speed, +50 stability, required level 40
Tier 2: 3g for 1 hump, 3g 25s for 2 humps
Tier 3: 10g for 1 hump, 10g 25s for 2 humps
Tier 4: 1 platinum for 1 or 2 humps