Ok, decided to add another crochet pattern. This one whipped up very quickly, like in 2 hours for me. Please, don't hesitate to let me know if there is any errors in this pattern.
2 balls Size 10 crochet thread (I used bedspread cotton)
Size B hook
Holding 2 threads together, Chain 23
DC in 5th chain from hook. *ch1, sk 1 ch, DC in next chain, repeat from * to last stitch. (DC, ch 1) 3 times in last chain. Now start working on the other side, doing the ch1,sk 1 DC pattern, using the same stitch from when you went across the row. End with 2 (DC-ch1) in the end hole (the beginning 4 chain). Do not join, but start to work in continuous rounds using the DC-ch1 pattern in the holes made from the first round.
When you get it as tall as the sponge, stop with DC at one corner, then do ch1, HDC in next stitch, then *(ch1, HDC) 2 times in the next hole, and around again until you reach the hole just after the HDC. CH1, sc in next space, slip stitch in next space. Cut thread and weave in ends.
Now take the thread you have been using, and chain 40. Cut off and leave the tails (or if you prefer, weave the tails back in). Find about center of the top, and using the hook, pull chain through, do a simple tie and you’re on your way to scrubbing!!
I’m sure that if you want to, you can sc the top shut, but I prefer to be able to change the sponge out when it becomes too gross to be used anymore (and that includes running it through the dishwasher several times), or if the sponge is totally worn out and falling apart. I just don’t like to throw away my handiwork like that.