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.
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.
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.
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
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
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.
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.
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.
There are many places to find boy baby shower favors such as Party City or Oriental Trading, but this site seems to have a great selection. http://www.babyshower101.com/baby_shower_decorations.html
A shower for a baby boy and a shower for a baby girl are both termed a "baby shower". There are different party themes that you can do for a girl baby shower. For example, you could throw a princess baby shower, a pink baby shower, a cupcake baby shower, a flower baby shower, a ladybug baby shower, and many other themes. See related link below for more inspiration.
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
Blue isn't a necessary color for a boy baby shower. You can come up with a theme that doesn't even have to do with a color.