It is not LEGO, but ....
What if you have the need to build but no LEGO blocks on you?
If you have an iPhone in your pocket or an iPad in your bag then there is an app just released that may save you.
Blocks! The True 3D Building App! Create, Move, & Play in 3D Space! This app is designed for both iPhone and iPad.
Released: Sep 04, 2010 Version:1.0 1.9 MB Language:English Seller:miSoft, LLC © 2010, miSoft, LLC.
$1.99 at iTunes