TSG noted that most kids wanted a helmet that looks similar to what the pros and older riders/skaters wear (such as Timo Pritzel) and not some dodgy mushroom covered in "wacky designs" so they have produced the Kid's Evolution Range.
There are three Pro Models (Timo, Cam McCaul and America) and four Plain Colours (black, red, white and flat grey) in the same great Evolution Design - but a little smaller - sized as XS/S.
The Pro Designs are £29.99 with the Plain Colours £24.99, and are EN1078/CPSC std certified.
So, if you want to encourage your little ones to get into the habit of wearing a helmet early on in life, you probably can't go far wrong with these lids. They're available from TSG here.