Materials for cable sleeving


I want to sleeve my case led cables ( the ones that come with the case that plug into the motherboard )

I wouldn't be asking this if there were any sleeving kits for sale in my area but the truth is there are none.

So the question is are there alternative way to sleeve cables not using sleeving kits if so please tell me what material I should be using. Those cables are rainbow coloured and I really would like to sleeve'em.

Thanks in advance!