Blueberries aren’t my favorite either but they’re healthy and I’ve come to really enjoy a blueberry smoothie/slush if it’s a third frozen pineapple and I use some pomegranate juice as part of the liquid.

I think part of why the combination works is the acidity, blueberry needs a bit of a boost in the tanginess department. Probably why blueberry + lemon is a common pairing in pastry.

Hadn’t noticed a texture issue, you might benefit from a more powerful blender to more completely annihilate them