I first thought of making my own rug after seeing a really cute rug that my sister had made. She made her rug out of old T-shirts and clothes that were going to be thrown away. I didn't have that many old t-shirts, but I did have a lot of scraps and left over fabric from various projects.
This was my first try and I love how it turned out. I didn't really care how the colors worked out, I wanted to use scraps and I like the look, but if you wanted you could plan out how it would look.
What you need: A LOT of fabric/scraps cut into 2 inch strips
A HUGE crochet hook (the biggest you can find, I found a big blue plastic on at Walmart)
a Pattern (if you are experienced in Crochet you could probably wing it, I started following the pattern I found HERE and then made some up as I went until it laid how I wanted it to.)