I get the luxury muesli from lidl's. They do a tropical fruit one and a nut/raisin one. I always prefer the tropical one as it has a little more variety. I also buy a granola one too, then I have a bit of both in the bowl. Most muselis I find a bit plain so I have brought banana chips, dates, diced up tropical fruit mix, nut mix previously to add. Some people add goji berries. You can also add sunflower/pumpkin seeds. They are only little packs and always very expensive for what you get in a pack.
I also bought some different cereal to try from home bargains which was cinnamon squares so I've been chucking a handful of that on the museli too. Other mornings I have museli and chop up fresh fruit like banana, clementines, grapes or add a spoon of natural yoghurt.
Last week I had chopped up watermelon and added museli.