Dive summary:

• Through the American Concrete Institute, you can give a hard-core construction colleague a heavy (244 pages) book about concrete, from the Romans to today. Naturally, it's a hard-cover book.
• From a maker in Maine, you can acquire handmade chocolate construction vehicles, so you might want scrape together some change or dig into your wallet.
• If you want to stick with concrete, however, a company called Concrete Cat has a line of handmade goods.

From the article:

If you are looking for more small concrete art pieces, check out Etsy.com and type in the search term "concrete." ...