Episodes suggesting a friendship
In Take the Plunge: Part 2, Flower asks Snowball to beat up Bubble due him being "strong", but he refuses to, then whispers to Coiny and Blocky that " Flower is starting to really get on my 'nerves". After hearing that Flower wants Bubble to be beat up, Blocky accepts the request for Flower and starts chasing Bubble, while being cheered by Flower, saying "Go Blocky!
In Reveal Novum, after seeing the eliminated players complains about being eliminated and plans for escaping, Flower says "You think you've seen anything? I've been in here for 16 months! I want out now!" and then proceeds to jumps on Blocky, screaming while attempting to open the TLC's lid.
Episodes suggesting a conflict
In Take the Plunge: Part 1, Blocky kicks Flower off the balance beam.
In Reveal Novum, after Flower jumped on Blocky, Blocky looks unhappy about it.
In Return of the Hang Glider, when Flower starts throwing recovery centers into the incinerator, Blocky looks to be against it. Blocky was in the crowd of people telling Flower to stop. After Flower popped Bubble, Blocky gasped, along with the others. When Flower was crushed by the UFO, Match and others except for Woody (due him being dead) to come out of the UFO, when Pen said that the UFO has crashed someone, Match asked who was it, which Blocky replies "It's Flower". After Match happily says "Well that's good then!", she and Blocky high-fived, probably showing that Blocky was happy about Flower dying.
Flower and Blocky could be neutral to each other at the beggining of the show, but in the later episodes, especially when Flower started throwing recovery centers into the incinerator in the last episode, Blocky's thoughts for her has turned negative. They might even become enemies after that, since Blocky's pranks are based on recovery centers, which as mentioned, she destroyed.