For the workshop please bring graph paper and coloured pencils as well as your fabric.
Your fabric choice will need at least 3 colours and think about how they interact with each other if they were transparent and layered on top of the other. One simple idea for colour would be to take 2 colours and then blend them and that blended colour is the middle colour. EX: blue and yellow fabrics plus green.
You can keep it simple or make it as challenging as you would like.
Other ideas would be to bring light to dark grey fabrics for a monochrome block, or bring light to dark of one colour and create an ombre transparency. Or use one colour and a grey and make that blended colour a greyed shade of the original colour.
Also bring what ever background fabric you would like to coordinate with your focus transparency fabrics. Probably 1/2 a metre would be enough.
Here is a pattern for a table runner you may wish to work on as well. Bring as many rainbow fabrics you might need to create the transparency effect.