Some damp tolerant herbs mixed with lavender? Like mint, vietnamese mint etc. I have two massive mint patches and they're a godsend for covering up crappy gardening.
Otherwise I'm a flax and grasses girl. Weedmat is also used a LOT at our place.
When things get really bad, you can;' beat some trellis at the front of the 'offending' area with something nice climbing over it to hide what lies behind....