(Not sure how inviting that sounds though.)
I have a little less tha half a coffee cup of cashews and one coffee cup of berries.
(Almost impossible to get a nice picture of this stage)
Mix until rather smooth.
If the yoghurt feels too sour you can add something to sweeten it up - I added a soft date but a little bit of honey, if it does not have to be vegan, or coconut sugar etc will also do, or some sweet enough fruit.
Next I think I'm going to start trying out chia seeds in puddings and fresh porridges! I've only had them in snack bars so far.
Edit: all berries we have here are rather sour. Well I suppose most berries in general are sour with a high acidity (or so). If you however use very sweet stuff you might wang to add a little dash of lemon or lime to get they "youghurty" sour feel to it!