My son used to be crazy about Lego when he was little...a cute creation...I think it would stand out alot more though on a plain background, like black for example.
I like the idea you have here, but I agree with the others the background is too distracting. I would try making a background in PS, to replace the background you have now.
For the invisible things of Him from the creation of the world are clearly seen, being understood by the things that are made, His eternal power and Godhead;... Rom 1:20