I forgot I had a half-finished random table of mounts sitting around; so I took a couple minutes and finished it up.
It's simply called "What's He Riding?". d20, four columns: mundane, wealthy, unusual, magical.
The 'mundane' column tells us something about common mounts and pack-animals in the Wampus Country - horses, donkeys, some alpaca. 'Wealthy' includes warhorses and such, as well as moderately-unusual mounts that eccentric folks might keep. 'Unusual' is weird but nonmagical, and 'Magical' is...well, you get the idea.
You could use a table like this when someone casts mount and randomize the outcome (I'd say roll a d6 and add the wizard's level, 2 mundane, 3-6 wealthy, 7-12 unusual, 13+ magical or something like that).
Some definitions for Wampus Country purposes:
horse - a pony, palfrey, or work-horse, pretty average and not trained for combat.
courser - a horse bred for speed.
destrier - a warhorse.
riding-snollygoster - any of a number of bipedal or semi-bipedal saurians suitable for taming and riding (like a duckbilled dinosaur, for example).
ponderous snollygoster - any of several huge (between rhino and elephant), quadripedal snollygosters (like a triceratops or styracosaur).
double-gator - a monster the Boy came up with, like a Pushme-Pullyu (a head at each end), but it's a giant alligator. I seem to recall one head breathed fire and the other ice or something; I need to stat this up.
raincloud - y'know, like a little stormcloud you surf around on like a slow hoverboard.
lil' twister - bigger than a dust devil, smaller than a full-grown air elemental, these adolescent sentient cyclones roam the prairie and are occasionally tamed as riding animals (a la Pecos Bill, but smaller).
chrome mustang - a shining silver-and-red (or silver-and-whatever) magical horse, apparently composed of metal and quite fast. The creature is exceedingly rare, and said to be blessed by the Lost Gods of the Sixty-Sixth Path, who watch over travelers.