A North-facing bedroom brightened up by candy colors and fun shapes. Picture by Fabrizio Cacciatore. Inexpensive but functional furniture by IKEA left room in the budget for hand-painted wall arts.

To cut on the material cost for the river rocks, instead of tiling the whole shower section, interior designer Celine Riard came up with a clever solution: a tree outline, reducing by almost 70% the need for the river rocks, and filing the rest with affordable tiles.

When young Jo, a baseball Yankee Fan, announced that he wanted a blue and red baseball theme, interior designer Celine Riard was determined to come up with a contemporary design that integrate these two bold colors and baseball memorabilia. Hand-painted windows and lines bring the whole color...