Anything would help because they are pretty much a prominently "featured" item the way it is now.
I would spray paint the visible one the color of mulch, toss several cheap shrubs in there, and mulch it.
And pressure wash those steps!
:)

Putting a bulls-eye around the covers won't really hide them very well.

If the rocks were removed and grass grown back the lids probably wouldn't be noticeable enough to cause a lack of curb appeal.

Rhodium has the right of it. Unless you are willing to re-work much of the front landscaping to make that silly little bed make sense there's not much else to be done.

I agree with the above posters. Dig out the old soil about 2 inches deep, put in some good topsoil and lay sod over the area. Then spray paint them "cammo" green.
Tear out all of the shrubs in front, then put down some pine straw mulch in those beds.
Shape up the big shrub on the corner.
Remove all of the garden ornaments. Hide the hose.
Consider staining the front steps a grey/brown color and spray painting the railings black.
Put a couple of tall narrow planters (darker colored) on either side of the front door and plant with colorful annuals that will spill over the edge (petunias?)
Remove the screens from the windows (amazing how much better the house will look) Store them in the attic.
Take off the glass screen door.
Take away the door mat.

Hope that helps.

Max,

I really like what Dog Ridge has said and how about a faded or muted orange or pumpkin colored door. Stain a faded smoke color on the rock wall to the left since it is holding the house up. It'll go with the black railing. Varied or grouped Taller bushes with more color that contrasts the house trim and goes with the front door. Should there be some kind of walkway from the front stairs meandering somewhere? JMHO. Aloha

I have seen people cover with azalea's before.

You might be able to get a shorter riser for the high lid and make it flush. Talk to either the septic service company or the firm that designed the septic system to find out if that is an option.