I used an 11×15 cake pan and used two boxed cake mixes. All of the decorations on the poker cake are edible.
I made the playing cards and dice out of white chocolate and colored with edible marker. The poker chips are rolled fondant and colored with edible marker. The red and black suit lay-ons are just colored sugar (purchased off eBay). Just used ready made frosting and colored it with Wilton colors.
This was a huge hit. I got some of my ideas off of this site and I Googled poker cake images and got some others. I purchased the molds for the playing cards off eBay and just melted some chocolate and spooned it in.
The edible marker doesn’t work great on chocolate so it did take some time to get them colored in. You could just use rolled fondant for all of the decorations, but we wanted to eat them and we loved the white chocolate.