I missed this, and it has only 3 days left to go, but Pioneer Dungeons & Games has a Kickstarter for a Critical Hit Dungeon Wheel. When you score a critical hit, you spin the wheel to find out what happens. It's an interesting alternative to simply doubling damage dice or using a card deck to spice up those crits. The campaign is struggling - it's about $120 short of its $800 goal.
There are stretch goals, too, including a Trap Wheel at $1000. Also, each wheel will come with four (2 wood-toned, and 2 colored) blank wedges so you can add your own options. Click on the image below to take a look!