Silken tofu is a fantastic base for loads of things. M&S do it, plus other places. It’s a staple. You can Google for ideas, but it’s basically a creamy texture that takes on the flavour of whatever you use with it, so sweet or savoury. It’s cheap but you only get it in small packets though it’s possible to buy in bulk.
There are so many ways to add flavour to silken tofu to make a dessert, but basically you need a main flavour and bulker, an added flavour for nuances and a sweetener
So, fruit such as raspberries, blackberries, stewed apples, passion fruit,
Added flavour could be squeezed orange juice, sherry, vanilla essence
sweeteners could be different sugars, such as rapadura, cane sugar, maple syrup
For chocolate desserts, I’d use cocoa powder with melted vegan chocolate
Original Biscoff biscuits, vegan digestives or ginger biscuits could make a base
Also Alpro vanilla yoghurt is a useful standby for a cold, custard type accompaniment
You can buy vegan food magazines or read online from your local library