When it comes to organizing a baby shower for boys, I tend to like the traditional solid blue or blue polka dot theme simply because I love the color blue and I like the simplicity of the polka dot patterns. Polka dot is also a perfect theme for girls or gender reveal baby shower.
Decorate for Polka Dot theme party by including polka dot print balloons, by scattering dot confetti on food table. You should be able to find it at most art & craft shops. Otherwise, you could use hole puncher on (pastel) coloured papers. My favorite balloon for this theme is the clear white polka dot balloons, they look absolutely fantastic! You could even try blowing one balloon in the other for an interesting decoration everyone will be talking about!
Balloon inside balloon by MrErikZilla
Use a circle cutter to make your food circle shaped. You could cut out cheese, bacon, bread, carrots, cucumber using the cutter. This will make a perfect finger food for your guests. Serve your fruits rounded using ice cream scoop. Try on soft fruits such as mango, watermelon, and other melons (cantaloupe, Galia melons) .
With your cupcakes, you can decorate it with M&Ms, or edible candy beads that come in various colors so you can use colors that match your theme. You could probably find polka dot print cupcake wrappers at your local store~ Serve some macarons on a plate, and possibly a large apothecary jar or two of yummy gumballs.
You can decorate the food table further with a centerpiece such as diaper cake, edible cake, cupcakes or candy boxes on a fancy cake stand, candy bouquet with frooties, sticklettes or lollipops. The candies can be given as favors. For the edible cake, you could get a pre-iced white cake and place macarons or dots fondant on it, otherwise try making a polka dot cake from video instructions on Youtube!