Used audacity to make a chirp sound, i think it's sine-sawtooth. Pretty easy thing. Nothing to lose from it being mp3. It's a pretty dirtily made sound.
Created some laser gun sounding effect. Played in different tones incase you wanted to use them for different weapons or whatever you want to use them for.
Another random experimental sound effect i made. All i did was really random noises like popping and kissing sounds, and blowing the mic. Then i edited it in adobe audition cs6 and tweaked it on audacity.