Do any of my readers CROCHET??????

Hi.  Do any of you out there crochet?  I have a dilema.  I have four colors that I am crocheting into 8" squares for an afghan.  Each color is a different stitch.

Red squares = 8 needed
Purple squares = 7 "
Rust squares = 7 "
Green squares = 8 "

I finished the red, purple and rust squares.  I started working on my green ones.

THEY ARE TOO SMALL!

I have been stretching them to fit but I fear that when I sew all the blocks together; I will encounter problems if I make it bigger.

I have never sewn crochet to crochet or to nything else before.

I don't want to start over so here I am asking for your help.

The only other thing I can think to do is change the stitch.

Oh, the stitches are as follows:

Red - half double crochet
Purple - single crochet and then double crochet to form little bubbles
Rust - double crochet
The Green Monster - single crochet

I think my tension is too tight or sumpin.

H.E.L.P.

Oh man, I know this is not the best picture but now you can see them all!

Any help would be really apreciated!

Thanks for stopping by...