This applies to my makeup too, I organise it so that face products go in the face product section, lipsticks in the lipstick section etc. I guess this is why I've never been that versatile with my products because I have to categorise their uses straight away. However at the minute I'm learning not to be so quick to put (for example) a blush down as being only a blusher.
The thing is is that your products are really versatile they don't have to be used only for what they are sold as. For instance at the minute I'm into doing a really coral-y, rose gold eye look so I've been using my blusher as an eyeshadow either all over the lid or blended into the crease.
I'll admit I've been the most experimental with using alternative products on my eyes as I've also been using my bronzer as an eye shadow as it makes a great transition colour. I usually use Buck from the naked palette but it can come off a little bit dark on me at times and my bronzer works as a great alternative for days when I'm wanting lighter toned eyeshadows or a little less definition in the crease. I've also been using my Soap & Glory Glow All Out highlighter on the brow bone as a subtle highlight.
There's loads of other products that can be multi purpose too! Eyeshadow primers can be used under the eye to help stop creasing and make concealer last longer. Cream blushes can be used as eyeshadows and lip stains, cream eyeshadows can be used like gel eyeliner and (depending on the colour) blushers and highlighters. Also those who are feeling particularly brave can apply a little lipstick to the cheeks and blend it out to create a beautiful flush of colour.
There's a whole world out there of experimenting to be done and for someone like me it can be a little bit daunting. But I guess by multi-purposing your products you are able to get full value for money out of them and it gives you the ability to create amazing new makeup looks you never tried before!
If you know of any more uses for products that I haven't mentioned please leave them in the comments!