Being the junior building block enthusiast that I was as a child, I’d have plumb lost my marbles over these.
Building block adhesive tape
and the PowerA Nintendo Wii LEGO Play & Build Remote 
Both can be built upon using the universal block molds.
Both are perfect gift ideas if you’ve run out of ideas for your darling (and often brilliant) “blockhead”.
https://www.amazon.com/dp/B004752HB4/ref=cm_sw_r_cp_api_whLxAb0C1EVPV
Ramsy's Joint 