I would think most games would be gender neutral at a baby shower... but you could decorate onsies with boy themes (trucks, airplanes, dinosaurs). Here is a website with some baby shower games! http://www.babyshower101.com/baby_shower_games.html
You can find baby shower ideas for a baby boy in different places. Books are a great reference, party stores, and even event planning services would provide ideas of plates around a baby shower theme for a baby boy.
Baby boy shower ideas can be found in good books or magazines in bookstores. One can also ask around others who have experience. Ideas can also be found in forums online.
pregnant.thebump.com/pregnancy/baby-showers.aspx this website has lots of cute ideas. You don't have to have a theme, you can just make a list of things you and your friend will be good ideas so it makes it more personal.
Some ideas for a boy's baby shower would be themes such as cowboy, trains, circus, baseball, football or any other sport. You can buy decorations and paper goods that relate to the theme you choose.
A centerpiece with a picture of a Baby boy on it or a Baby girl is a really good idea for a baby shower centerpieces. Also a picture of a diaper and a binkie might be good.
www.babyshower101.com/baby_shower_decorations.html Has good things for a baby boy, and you could even put things with it , you could do a baseball theme or a sports theme for you shower
Some good themes for a Baby Boy baby shower could be easy with just blue or more creative with things like rubber Duckies,Monkeys,Prince crowns, and so on. http://www.partypail.com/boy-baby-shower-themes.html
Typically boy baby showers are done in blue. Bright colors such as red and green would be fun, but you can always choose different colors (yes, more than one is good too!) This website lists great color coordination ideas: http://www.baby-shower-ideas-galore.com/boy-shower-ideas.html
For baby shower favors you can get a lot of ideas from beau cou and also order some decently priced favors from their website. They have everything from boy to girl themed to even neutral in case the gender is unknown.
It depends on if you're having a boy or girl for the theme colour! But I have seen crystal pacifiers which would be ideal as favours on www.amazon.com
Some cheap baby shower party favors would be bubblegum cigars, streamers, pacifiers and its a boy/its a girl confetti.
Some of the most popular baby shower favors depending if it is a girl or boy is pink or blue, baby bottles and rattles, bears, baby shower cakes. Just don't forget to get for a boy or girl depending on what the person is having