If you're looking for an interesting tie knot that isn't too complicated, try the Van Wijk knot. It's subtle, yet still fun and classy. You can wear it for a party or in the office, making it a good all-round tie knot option.
You'll need a lot of fabric from the wide end, so the narrow end should only reach to about the third or fourth button on your shirt.
Pull the wide end across the narrow end.
Wrap the wide end around the back of the narrow end.
From this step on you will wrap the wide end around the narrow end a couple of times, but you need to make room for the loop where you will thread the end through in the final steps. Place your right index finger (or left if you find that easier) over the area where the knot will be and leave enough room to pull the end through later.
Go around your finger once more.
Go around your finger another time (three laps total if you count the first one in slide 3).
Bring the wide end up through the big loop around your neck.
Thread the wide end through the small loop where your finger is.
Pull the wide end until the knot is the right size and use the small end to adjust the length.
If the narrow end is too short to reach the loop on the back of the wide end (which is very likely to happen with this knot) you'll have to get creative with making sure the narrow end doesn't slip out to the side. A safety pin, scotch tape or using a magnetic tie are all good solutions.