Many many patterns and kits are made from traditional block designs that have been handed down through centuries or decades. If you look at a quilt-- just look at it, not measure it-- and you can make it, I say go ahead.
You will need to determine the size of the block, how many pieces needed of each shape, which colors go where, the size of the quilt, how big and how many borders, the fabric requirements for top, backing and batting. If you do all that, in my opinion, it's your quilt.