If you need inspiration go here...
http://www.coolhomepages.com/
If you want to improve or get ideas, just look around you. At everything.
Study other peoples designs, and styles. Work out what kind of style you like and are best at (this will only improve and change with experience. As you get better you will expand, but just start with 1 style to focus on at first, then move on.)
Study element placement and proportions.
Study their use of fonts, this is very very important. Fonts can ruin a design, and when working best, they should compliment the design. Text doesnt have to be special and wow.
Look at objects around you, vases, carpets, rugs, tiles, roads, trees, spiderwebs, flags, mirrors, bags, labels, books, flowers.....there is design in EVERYTHING. And more often then not you can take an idea from something, even if just a small element.
You could even buy some watercolour pencils, paint your own background too....something I am doing today. Have to stock up on stuff.
And remember, its design not art.
Oh yeah, get down to your newsagent and buy some magazines.
I buy Computer Arts and IdN most months. IdN is extremely good at profiling international designers and design houses, I thoroughly recomend it.