I would charge at least $1,000. first of all, you are going to have at least $250 in materials for the top, back, batting and thread. Even if you are using scraps, you paid $11/yard for the fabric in the first place. the cost to quilt, even with a basic panto is going to be around $200, to bind it about $50. So now you are up to $500. Then you have to piece it. Lets say you are making 10" squares and it takes a half hour to piece one (remember to include the time it takes to press, then join). That's 100 squares, or 50 hours. I hope you feel your skills are worth a minimum of $10/hour, or $500. There you have it. $1,000