I love to crochet, and thought it would be nice to make some flowers for my cards. I tried making them with worsted weight yarn, but no matter what size hook I used they were always too big. I guess they would be good, if you were using one flower as the main focus for your card. Here is a sample of the ones I first tried to make.
As you can see, these are quite cute. I just used a flower from an afghan pattern I had. It is the same flower, but each one using a smaller hook. Of course, with thick wool, using a small hook is a real pain!
Finally, I decided to try them with embroidery floss, and a size 1.75mm hook, and it worked perfectly. They are smaller, and I like the colors better. They actually match the copics better than wool. Here is a sample of some I made.
I find these are much nicer than the wool. I also figured, you could use a smaller stitch in the flower. If it calls for a double crochet, you could use a half double crochet. This will make the flower even smaller.
I have so much embroidery floss, and this is the perfect way to use it up. These flowers don't take long to do. I guess about 10-15 minutes each, and it took about 1 spool per flower, which is very inexpensive.
Well, I hope you will give flower making a try. There are tons of patterns on the net, just try using floss instead of wool.