> "122079103" and "toldulbal" (tolerably dull ball) are equally hard to attack.

I believe this is only holds if the attacker has no further information on the password generation procedure. In the generated passwords, vocals are almost guaranteed to occur at least once in every triple. Also certain consonants have a higher probability to occur together, due to contraints of the english language. This should decrease entropy.

It generates passwords by repeatedly picking a random 3-letter prefix from a pool of 1024 ("tol dul bal"), then generating a phrase that would abbreviate to that password ("tolerably dull ball"). This makes analyzing the effective entropy easy.

1024 possibilities for each group of 3 characters is approximately equal to 1000 possibilities for each group of 3 numbers.

WordPass doesn't really solve the 'easy to memorize' problem, since it injects random numerals. https://news.ycombinator.com/item?id=7793469

Abbrases require very little effort to remember, since phrases are very easily imprinted.

This seems like an overly complex Diceware. Not only do I have to remember the phrase (Diceware), but I have to remember the first three letters of each word in the phrase. Interesting, but cumbersome.

Diceware passwords are jumbles of words. They are unlikely to resemble sentence fragments, since they don't try to preserve grammatical links.

The hypothesis is that grammatically sensical groupings of words are easier to memorize than jumbles of words.

I usually look around me and pick 4-7 random objects, then take the first 3 letters of each. Is this secure?

How many distinct objects are around you? It's a small pool, so there aren't many prefixes available (maybe 100), so the entropy if an attacker guesses the items around you wouldn't be very great.