Here's an easy way to turn a blah lampshade into a beautiful custom shade. You can find great shades at garage sales and thrift stores for next to nothing. Your really just looking for a great shape. You can cover everything else.
First, I ripped the trim pieces off of the shades so there wouldn't be any bumps. Don't toss it.... you can use it later. Then I cut my fabric into fat strips, with the top being slightly smaller than the bottom. Each lampshade will be different. You can always cheat a bit and cover gaps or overlapping areas with pieces of trim.
Next, I used spray adhesive to cover a section or two at a time. Be sure to work in a well venilated area. Spray adhesive is really smelly. I used clothes pins at the edges to make sure there were no gaps at the top and bottom. When this dries, go around and finish edges. I used spray adhesive but then I went back and used the trim pieces that I ripped off of the original cover to finish the edges.
Finally, I added different trims to hide the messy edges and to give it personality.
Happy hump day!