Btw, I have tried now following code:

```python
ico_path = os.path.abspath(os.path.join(os.path.dirname(__file__), '..', '..',
                           'gutter_mark_themes', '{theme}-{type}.png'))
```

And it returns right path to icons, but icons are not visible in gutter. I guess that it means that sublime does not support absolute paths to gutter icons.