a question

[blueloo123]

I am making a cozy for my gps system. I'm a pretty novice crocheter. I taught myself to crochet with some help from my great-grandmother over Xmas. My problem is that the edges of all my peices look messy. How do I keep the edges looking neat?

Here are a few pics of some stuff I've made so far!






A washcloth for my sister.




A scarf for me!