How to implement multislot inventory system?

Hello,
I wanted to create an inventory system for my game. Right now its simply a slot based system where you have all picked up items in the individual inventory slots which are arranged in 5x4 fashion under uniform grid panel. But the thing is i want certain items to occupy more slots or space in the inventory say for example weapon occupies two slots of inventory which means either two consecutive rows or columns slots are to be filled with the weapon image so that player can understand weapon consumes two slots of inventory. Is there anyway to render the item’s texture over of that ‘chunk’ of space? Please let me know any thoughts or suggestions to achieve the same. Thank you.