mixing yarn weights?

[Patticatti]

Have you ever mixed yarn weights in a pattern? I want to make a crocheted afghan using a variety of left over yarn. I found a pattern I like that uses black as a main color with rows of different colors between the black rows. I have a lot of sport weight black yarn but most of my other yarn is worsted weight. Do you think I could use both weights in one afghan?

[Shandeh]

You could try, but the sportweight yarn will not work to the same gauge, so it would draw in your work, and be thinner as well. I would not recommend it, though.