Many people feel that the Ultramarines are the "boring Chapter" for the Space Marines. I don't know that that's entirely accurate. Maybe back in the day when they were the "generic chapter" that Marines defaulted to out of the codex, but not so much anymore. But anyway, whether you feel that or not, there's a new Contemptor Dread for the chapter that you can order now from Forge World.
From the website:
The Contemptor Dreadnoughts of the Legiones Astartes enabled the mortally injured warriors interred within them to continue to serve their Legions during the Great Crusade, and many fought at the forefront of some of the bloodiest and fiercest battles of the Horus Heresy. A large number were destroyed during those dark times, but some survived and are still in service in the Space Marine Chapters and Chaos Space Marine warbands of the 41st Millennium. This Contemptor Dreadnought bears the heraldry and iconography of the Ultramarines.
The barrel-chested torso of this Contemptor Dreadnought is dominated by a winged chest piece. which features the Ultramarines Legion symbol. The right shin also features the same iconography, whilst the right shoulder pad includes the Legion's number. Available to both Warhammer 40,000 and The Horus Heresy armies, the Ultramarines Contemptor has been designed to match the aesthetic of this most noble brotherhood in either setting.
This 18-part resin kit makes one Ultramarines Legion Contemptor Dreadnought and comes with supplied with a 60mm Citadel round base. Rules for the Ultramarines Legion Contemptor Dreadnought can be found in The Horus Heresy – Legiones Astartes: Age of Darkness Army List. Ultramarines Legion special rules are available in The Horus Heresy Book 5 – Tempest.
Please note that the Contemptor Dreadnought arms pictured are not supplied – the kit is compatible with all Contemptor Dreadnought arm options, which are available separately.