Fernando Alonso, Lewis Hamilton and Daniel Ricciardo have continued the trend of commissioning a one-off helmet design to mark the annual trip to Monaco.

Alonso, no stranger to tweaking his livery from year to year, has unveiled a gold-and-white design featuring a series of jigsaw pieces commemorating his F1 victories through the years, along with the obligatory sponsor logs and the word 'Monaco', complete with signature lightning bolt emanating from the final 'o'.

Like the Spaniard, Ricciardo, who continues to be mentioned as a possible replacement for Mark Webber at Red Bull next season, also posted images of his new helmet on Twitter to show off graphics, which include a rather garish 'Monaco' spelt out on top, but a rather more spectacular rendition of the Principality's famous harbour across the back.

Hamilton's effort, meanwhile, took things to a whole new level, with a gold background carrying on the Monaco vista idea, but with a graffiti-style portrait of himself, girlfriend Nicole Scherzinger and new pooch Roscoe riding, top down, through the streets.

Hamilton's replacement at McLaren, Sergio Perez, also took the wraps off his Monaco helmet, which features a notable diversion from his regular look. A black background features the red and green of Mexico on separate sides, while the almost obligatory image on the back of the helmet reflects the Principality's famous casino. The helmet is due to be auctioned for charity after Sunday's race.

Alonso heads to Monaco among the closest challenger to current points leader Sebastian Vettel - who is also expected to produce his own 'Monaco special' helmet to join a long line of redesigns - while Hamilton slipped back in the rankings after a disastrous Spanish GP.

Ricciardo, menwhile, took a tenth-place finish in Barcelona, his second points score of the season following an impressive run to seventh in China. He currently sits twelfth in the drivers' standings, one place behind Perez.