Nintendo Bomb Skin:

By Altair

To Install copy the weapons folder to;
X:\Program Files\Steam\SteamApps\[USERNAME]\counter-strike source\cstrike\materials\models

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Nintendo Bomb Sounds:

By CheeseN!P

To Install copy the sounds folder to:
X:\Program Files\Steam\SteamApps\[USERNAME]\counter-strike source\cstrike\

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Other Credits:
Valve (Orignal bomb model), Nintendo (Orignal Sounds and Images)