speck

I need to write a speech about any topic that would interest 16-17 year old for my English course but I have no idea what to talk about :/

what colour is best?? green black white yellow pink purple or blue

Where can i buy one of these in the UK? I don't mind if it is online but i can't find a company who sells them. I even looked at importing one from the US but it was going to cost about £55 so that is not an option