Anyone who wandered Board Game Geek's Arkham Horror gallery last December might have noticed a custom dice bag masquerading as a Monster Cup: www.boardgamegeek.com/image/409262 Much thanks to Twinim for sharing, as I was inspired to seek out this Marsbarn and order my own. (I'll try to post a picture on BGG.) Here's Marsbarn's site: www.marsbarn.etsy.com
I got a solid Royal Purple with a Yellow Sign in yellow felt stitched on the outside, and Spiderwebs on the inside. In a dark room, the black webby interior looks bottomless. If you max out the Monster Chits (every Expansion, including the Masks), the resulting chit mass barely reaches halfway to the top. Gobs of room to reach in and shuffle and fish around.
Marsbarn was willing and able to customize my Yellow Sign from a single large JPG of it. From request to explanation to ordering to payment to shipping took less than a week. $15. BARGAIN.
If FFG isn't gonna provide its own Cup, this is a perfect substitute, and it's customizable for your own uniqueness. Might I suggest the tentacles on the back of the Madness deck? Or maybe the Black Goat Expansion icon?
My HIGHEST recommendation.
