Their 12 DIY Ideas for Creating Inexpensive Art has some pretty good tips to check out, here are the first five:
1. Repurpose Wallpaper
Intricate or bold wallpaper designs can become modern art statements when framed and hung. Make sure to use enough paper to clearly show large or repeating patterns. Frame one large piece or use several smaller frames to repeat the same design in a cluster.
2. Press Some Flora
Single large pressed leaves or groupings of flowers make great subject matter for homemade art displays. Press and dry, mount on a white background, and frame simply. Experiment with off-center arrangements and mix plant types for visual interest.
3. Make a Collage
If you’re feeling creative, try your hand at collage. Use photographs, text, scrap wallpaper, and other media to create an original piece of art. Collage is a forgiving medium; just cover up what you don’t like and try again.
4. Snap in Black and White
Use a digital camera and printer to experiment with black and white photography. Snap images of faces, landscapes, architectural details, or close-ups of unique design features of almost anything. Manipulate and refine your photos using photo-editing software. Group together or create a mini-gallery in a long hallway.
5. Channel Warhol
Product labels with bold or classic graphics make excellent subjects for artwork. Labels from canned food, vintage perfume bottles, bars of soap, or fruit crates are particularly good places to start. Carefully remove labels (soak stubborn labels in warm water and then press dry), mount, and frame.