Who has an ulcer T.mouse? Has it been properly diagnosed, and is it being treated? What symptoms is it producing?
A bland diet doesn't mean lacking flavour, it just means that the food is easily digested, not too acidic/spicy/fatty, and typically low fibre. Carbonated drinks, alcohol and caffeine can also aggravate the stomach.
So that leaves lots of foods you can eat 
Refined carbohydrates (white bread, white pasta, white rice, processed breakfast cereals (finely milles oats, cornflakes, etc.)).
Lean meats
White fish
Eggs
Soups (not too creamy/spicy/etc.)
Cooked vegetables
Cooked fruit
Dairy
Small amounts of fresh fruit (not citrus)
Rice pudding, custard, jelly
And so on 