I've seen this Pompom Garland on Etsy. Millalove describes the garland as "possibly the happiest thing I've created"! I must agree: this garland will bring happiness to any setting. Millalove is based in the UK, which means you won't have to wait too long for shipping if you want to order one!
Pompoms are easy to make (many of us have made them as children) so you can also make your own pompom garland if you have some time on your hands. You can find instructions for making pompoms all over the web, for example here (movie) and here (written instructions)!