Make furniture-quality cuts with a circular saw with these inexpensive DIY saw guides. Make both from medium-density fiberboard in just a few hours, then use them for years. Learn about the two essential saw cutting guides.
Add a strip of trim a bit above already existing baseboards, paint between, and you get faux thick baseboards! Other good ideas here as well. 31 Easy DIY Upgrades That Will Make Your Home Look More Expensive