This activity has been around ALTopedia for a while, but it always goes down a hit with my classes. I will use this for my final lesson of the summer when Year 3 will finish Let's Try Unit 4.
Simply divide the children into teams and write a point chart on the board. Get the kids to play rock, paper, scissors to decide who within the team speaks first. Get the first speaker to say "I like (colour)". Click the colour to reveal the points for the team. You can change the next round to "I don't like" so they are practising both.
There are 4 rounds of 4 questions, so teams of 4 is best, but I have small schools and can do this easily.
You can use this as a warm up or take up the whole lesson.
Edit: I have just noticed I have left the weather slide in. I don't have time to alter it and reupload it in my inaka school, sorry! Just be aware.