Well, here's how I did it:
1st - I set up an art museum in the classroom. Flash cards with copies of paintings by the most famous painters were displayed on the walls all over.
2nd - Kids went on a tour and asked each other: "Do you like this painting?" / "What's your favorite?"
Expressions like "Oh, that's beautiful!"; "I really like it"; "so, so"and "not so much" were practiced before.
3rd - In small groups kids chose one of their favourite paintings to copy themselves with brushes and paint.
The surprising choices were: The persistence of memory by Salvador Dalí
And The son of man by René Magritte
4th - While painting, there were speaking activities happening.
My "language plan" for that lesson included talking about school material, colours and the use of the present continuous. For that reason, structures like, "What are you using", "What are you doing", "Do you need more yellow paint?"... were used on purpose.
- And the paintings were displayed in the classroom.