Paul Addison, 40, pleaded guilty to five counts of criminal damage at the Wirral magistrates court near Liverpool.
Stephen Fletcher, 35, was sentenced to five weeks of unpaid community services after pleading guilty to the same charges.
The two said they represented a pressure group called "Real Fathers 4 Justice." The group says it is fighting for the rights of fathers in custody cases.
The incident left purple stains on the grass as Tiger Woods and Sergio Garcia approached the final hole on Sunday at Hoylake. The players didn't seem affected, and Woods made a par putt to win the tournament by two shots.
Eight weeks: You don't even get that for committing serious fraud these days, but then it is a bugger to get off that purple dye.