Oh gosh, you guys! I'd pretty much come to terms with making another one, but you've all been so lovely, I'm back to wondering if it might be right after all!
My original plan was to have sashing, although the big blocks actually had one of each colour in them, so the sashing would have been in between all the ones of the same colour, then I laid it out with them all together (was having trouble choosing the right sashing fabric) and it looked better than with any of the potential sashing fabrics so went with it and decided to do a border instead. I even made a thin pieced border to try and make it look like I hadn't just plonked a border on it...so it would be plain border, pieced border, plain border.
I might just put the border on and see if I like it more then...if not, I can always take it back off!
Thank you all so much for your advice...I think I always get nervous with quilts for other people as to whether they will like them or not. I made a tardis quilt for a Dr who nut and got nervous that he wouldn't like it! He's a Dr who nut, how could he not like it! I haven't given it to him yet but I am now sure he will like it!