Panzanella is a tasty Italian salad that makes great use of stale bread. There are many recipes for it but easy to improvise.
I like to use stale ciabatta bread, torn up into a large salad bowl then adding either chopped heritage tomatoes (full flavoured) or baby plum tomatoes - mixing it in so the juices absorb into the bread. The basic recipe is then to add olives, vinegar and oil (possibly chopped anchovies) but I also add chopped celery and organic watercress (for flavour and different textures). Instead of fresh tomatoes, sun blushed tomatoes (semi dried) are a great alternative. Often, instead of anchovies, I add some tinned flaked tuna or chopped chorizo. It's flexible - easy to improvise.