Liquid Motion Timer

Going with the idea of having a see through toy vessel and then having colours inside, I want to have a go at making something a bit like a liquid motion toy: 

Having the vessel take the shape of a certain toy and then having the different colours inside. One perhaps representing positive and one negative. Which represents the toy embodying the different emotions of the collector. 

I've just watched quite a few videos on how to make them on Youtube. I wasn't sure whether to go down the route of the lava lamp. But to keep the flow of the colours moving you have to put in a tablet to set it all off. Where as the liquid motion timer allows the colours to all ways move and float around when shook or held. Which also represents that once owning the toy the emotions are triggered.