From 1.13, Chests can be placed next to each other. This might offer much more compact storage room layouts. Chest will be combined only by shift-clicking them onto each other like hoppers on chests, but if placed normally on the ground, they can be placed next to each other in any manner. Also, item frames can be posted on the top and bottom of blocks.
Will you re-design your storage area? Where will you put item frames if you place them more compact? Show us your best storage area layout!