Children can get crafty with lots of fun ideas of things to make. They can play games or test their knowledge by taking quiz. There are also famous pieces of art and artists to explore. https://www.tate.org.uk/kids
This page has lots of short video clips for KS2 children to watch and follow the instructions to see if they can replicate a piece of work. https://www.bbc.co.uk/bitesize/topics/ztjqtfr/resources/1
A great informational resource for each year group about their artist study as well as the era of art: https://www.ducksters.com/history/art/pop_art.php
Art Projects for Kids
There are some useful ‘How to draw’ galleries on this site which give step by step instructions on how draw and paint lots of your favourite people and things.
The National Gallery Kids App
The NGAkids Art Zone app contains eight interactive activities inspired by works in the collection of the National Gallery of Art, plus a sketchbook for freehand drawing and a personal exhibition space where users can save and display art created with the programme. This app is aimed at KS 2 children.