Sphero Education have created STEM challenges which can be completed by using Sphero. There are many ideas from schools across the world on Twitter and Pinterest but here are a few lesson plans available from their website which could be useful.
Challenge Documents: STEM1-2keb1cn
Bridge Building Challenge
Challenge Documents: STEM2-22jakud
Hydro Hypothesis Challenge
Challenge Documents: STEM3-1s5ympp
Maze Mayhem Challenge
Challenge Documents: STEM4-15g3uf4