I just added sizes 6/8/10 and 12 years old to my design Frost. It's a sweater made with Létt-lopi (or any worsted or aran weight yarn). It features a traditional Icelandic yoke and a high neck to keep kids warm.
I recently made it for my son who is 8 years old. He chose the colors himself and insisted on using neon colors for the pattern. The picture doesn't display how vibrant they really are but I do like the result.
The pattern can be found here.