Granny square
Chain 4, join last to first to make a ring.
Chain 3, Double crochet 2, chain 1, (double crochet 3, chain 1) x 3 = 12 DC counting original chain 3 - join to original chain 3.
Now you can turn, or chain ahead (that isn't the word, hope you know what I mean) to the first chain 1 space.
Chain 3, double crochet 2, chain 1, double crochet 3 in first space. DC 3, chain 1, DC 3 in the other 3 chain 1 spaces.
Next round, make 3 DC, chain 1, 3 DC in each corner, and just 3 DC in the middle spaces.
Repeat until it's big enough.