Easy but fun way of making cards and art for the walls already at a young age: precut paper in various shapes and colours, take out a glue stick, and off you go.
My boy was about 1 year and 3-4 months when we did something like this the first time. He quite enjoyed just choosing the bits and distributing them, on the paper, and initially I helped him glue them. When the kids have grown older, I have also shown them that by putting e.g. tree triangles on top of each other, you can make a spruce three. After giving a few ideas like these, my daughter, now 3, has herself used various shapes to build a house with windows etc. Creating these type of art has given a natural opportunity to train colours and shapes with kids too (as our kids grow up speaking 3 languages we are pretty aware of creating opportunities to support the language development): “Please give me the red triangle and the blue oval?”
I seem to be good at stealing ideas from children’s programmes: first there was making an instrument from Angelina Ballerina, now this idea with some adjustment is from the Maisy Mouse’ Christmas DVD.
Here is another pretty cool thing to do with a glue stick and shapes, maybe rather for a bit bigger kids and especially as a group exercise.