You coud get model paint or acrylic even normal house paint - if the lamp was going to get to hot.
The paint might take better if you brushed on some PVA glue on the spoons first and let it dry before painting.
My friend and I saw this really cute DIY pineapple out of spoons. Problem is literally no where around us sells yellow spoons and we don't have a credit to buy them online
What paint should we use to paint white plastic spoons yellow?
http://www.pinterest.com/pin/258182991113140897/
Here's the link to the project we wanna do