I found in Play Group, where we do an activity each week, most 2/3 yo kids are interested in sticking 'stuff on stuff' and that's about the extent of it! LOL
I think you are already thinking of working with textures and themes, which would help his thinking about the world very well.
Your LO can glue cotton balls to a print out of snowman or santa's beard.
A theme can be seasons, dried/pressed flowers glued onto something, or leaf rubbings.
All sorts of materials stuck on paper fits them well - felt, glitter or coloured sand on a gluey page (can add food colouring to salt for coloured sand),
http://www.dltk-kids.com/animals/tproll.htmlYou could do these toilet paper/paper towel rolls for a theme, eg animals, and talk about the animal, sound it makes, what colour it is, if they fly or walk...