FINALLY! Ikea is carrying a lamp shade that will work with normal lamp harps! I was there last night, and got to check these out - it's a nicely designed simple soft white shade that's part of the new JONSBO lamps/shade series. 14" x 9" and only $10 bucks!
I was always so frustrated with Ikea's proprietary lamp/shade system, sure you could try to jerry-rig them to fit typical lamps, but it would never really look right. Hopefully this will be a successful line, with more colors and sizes in the future!