When a stubborn window shade stays down, no matter how hard you tug on it to activate the spring that rolls it up, you need to increase the tension on the shade's internal spring mechanism inside the roller to get it to work. It's a quick adjustment, but you may have to repeat it until the shade's spring tension is just how you like it.
Lamp I made for my best friend with personalized 35mm slides turned into a lamp shade. www.iprintfromhome.com will mail you slides from digital pics you upload onto their site. I bought a cheap lamp, disassembled the shade, hole punched the slides and connected them with jump rings (for jewelry making) from the craft store. Fun project!