Best way to cover stair using concrete retaining wall block

Question

I have spent 3 days creating this stair and I still don't like to look. The reason is that I have tons of those retaining wall blocks so I have to use them all to create the stair.

The first try was to have 1 block row per step and that was too narrow to walk (only 7" depth). The second try was to put retaining wall cap (8" depth) on top but that was still not long enough for human foot.

The last try is to 'double' the row to 2 blocks and now I have 14" depth to walk. This is acceptable to me as I tested it. BUT now I have a huge problem with somewhat an ugly look. Plus they are not really tight and move around.

This is the block:

Source: http://www.lowes.com/pd/Tranquil-Flagstone-Concrete-Retaining-Wall-Block-Common-11-in-x-4-in-Actual-11-6-in-x-4-in/3722164

My question is how best to secure and cover the stair?

I have some options:

1. Use 14x14 (2" thick) concrete pavers to put on top. It's possible but then I am wasting the blocks on the bottom as they are completely covered now.

2. Fill crushed rocks in between the cracks and leave them be. I know they will fall apart. So maybe I put some retaining bracket in the bottom and top row?

3. Fill concrete in between the triangle gaps. But I am wondering if the concrete will crack?

4. Fill in "something else" like gap filler to prevent cracking but also cover the cracks / gaps? I don't know what materials to use here.

5. Completely pull this apart and buy something else for the stairs. Wasted 3-day.

I am leaning toward Option 4 but just don't know what to buy. Also the color is Tranquil so I don't know if the outcome will look ugly (in a different way).

Please help.

Answer 1

I think they're nice looking stairs... I would suppose that it's not going to sit perfectly still without a stout concrete base, or without some kind of retaining system (like rail road ties or long blocks or something) but I think crushed rock is probably a suitable alternative, too.

After a couple years, you will probably need to add something to fill it in. Then I might opt for a more ornamental gravel.

Alternatively, you could go for the natural look if you fill it in with soil and grass seed; as grass and stuff begins to grow it will also help it settle and hold it's place.

Since you have angled blocks/pavers... yo could try the (fancy) round stair look.