For this theme- it's simply all about shapes! Important things to focus on are shape names, sorting shapes, and building things out of different shapes.
Here is a FREE website for shape play-doh mats. If you don't have a printer, you can create something similar to these with just paper and marker. https://www.fantasticfunandlearning.com/shape-play-dough-mats.html
I've noticed Pete the Cat is always a hit with kiddos. Here is a fun video that goes over shapes and colors-
For an activity that goes along with the video- try making this Pete the Cat shape craft.