Building a full-size lamp using LEGO bricks
The lamp is made by LEGO artist Sean Kenney. Along with some other items, he sells the lamps on his website. They are available in a range of styles and colours, but they are quite expensive.

Since he is selling the lamps I think it is unlikely the plans are available, although the pictures on his website are quite high resolution so you may be able to replicate the design. (I have no idea about the legality of such though).