After the nice surprise of finding those awesome "Skylanders Giants" sets at 5 Below and seeing how great the portals work for fantasy projects, I decided to hit up the Game Stop closest to my house to see if they had any different styled portals (each update to the game has had a new style of portal).
They were having a "Buy 2 Get 3 Free" sale on all of the used Skylanders/Disney Infinity/etc. game accessories. I found 2 different styles of portals (Swap Force and Trap Team). I picked up 4 Swap Force and 1 Trap Team portal for $16.
The Swap Force portals just needed the cords removed to be useful, but the Trap Team one needed to be disassembled to flip the clear center over so that the textured surface was on top. This required cracking the white ring all of the way around, flipping the disc and then reassembling and gluing the ring as there were no screws and the whole assembly was glued/sonic welded. It was a pain in the backside but a necessary move in order to make the piece far more impressive once I modify and paint it.
Swap Force Portal:
Trap Team Portal: