Turtle icons — design crit

Each card shows the icon at 14 px next to the “Running” badge (how it'll actually appear in the activity page), plus a 32 px preview so you can see the detail. Filled silhouettes only — outline icons lose too much stroke at 14 px for the shape to read as a turtle, and filled shapes carry more contrast area, which is friendlier for low-vision users.

Filled — best fit for the use case

Running
Current (Figma attachment)filled illustration
Running
Material Design Iconstop-down · Apache 2.0
Running
Fluent UI (filled)silhouette · MIT
Running
MDI Tortoiseside profile, walking · Apache 2.0
Running
Framework7 Tortoisetop-down w/ head + legs · MIT
Running
Fluent High-Contrastsilhouette + shell detail · MIT
Running
EmojiOne (monotone)side profile, characterful · CC BY 4.0

Ornate / game-icons style

Running
Game-icons: Turtle (Lorc)top-down · CC BY 3.0
Running
Game-icons: Tortoise (Delapouite)walking side profile · CC BY 3.0
Running
Game-icons: Sea Turtleswimming · CC BY 3.0

Pixel / novelty

Running
Piconbitmap-style · OFL 1.1
Running
Dinkiebit-crushed · MIT
Running
Pinhead: turtle-toptop-down w/ shell segments · CC0

Full-color emoji — probably too loud for row context

Running
TwemojiTwitter emoji · CC BY 4.0
Running
Fluent Emoji FlatMicrosoft · MIT

Note: neither Tabler nor Phosphor ships a turtle glyph. Lucide has one, but it's outline-only — pulled from this comparison because at 14 px the outline doesn't read as a turtle.