What were the ponies in Turnpike Tavern playing with?

[Aray_dash]

In ch6, when LittlePip talks about Red Eye, there are some pony around a table gambling, so what are they playing exactly?

Here is the paragraph:

“Ayep,” agreed a buck from a nearby table as he gathered a pile of bottle caps from his cross-looking companions, many of whom were looking at colorful squares in disgust.  “Just let ol’ Red Eye try an’ come out here and make New Appleloosa part o’ his so-called ‘new world’!  Ah’ll personally take all his unity an’ brotherhood an’ shove it right up his...”

I'm translating FoE into Chinese. Wish someone could help.

[SilverlightPony]

Standard playing cards, I imagine. Littlepip had never seen them before, so didn't know what to call them.