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The good news is that six months after Laser Eye Surgery, you can, in most cases, wear coloured or cosmetic contact lenses. You will, however, need to see your optometrist before purchasing any coloured lenses as the shape of your eyes will have changed due to the surgery.
To a certain extent, this depends on the characteristics of your eyes. Your optician will be able to discuss with you what is best in your individual case, but as a general point, it's recommended that you wear your contact lenses for a maximum of 10-12 hours per day. Wearing your lenses for longer may cause your eyes to become uncomfortable, red and prone to infection.