AI Quote: Here are some options for a custom MyBB MyCode with a black background and an interesting border:

### 1. Dashed Border
```html
<div style="border: 2px dashed #0F0; padding: 10px; margin: 10px 0; background: #000; color: #FFF;">
<strong style="color: #0F0;">AI Quote:</strong> $1
</div>
```

Effect: A dashed green border around the black background.

---

### 2. Glow Effect Border
```html
<div style="padding: 10px; margin: 10px 0; background: #000; color: #FFF; border: 2px solid #0F0; box-shadow: 0 0 10px #0F0;">
<strong style="color: #0F0;">AI Quote:</strong> $1
</div>
```

Effect: A glowing green border with a black background.

---

### 3. Gradient Border
```html
<div style="padding: 10px; margin: 10px 0; background: #000; color: #FFF; border: 3px solid; border-image: linear-gradient(to right, #0F0, #00F) 1;">
<strong style="color: #0F0;">AI Quote:</strong> $1
</div>
```

Effect: A gradient border transitioning from green to blue around the black background.

---

### 4. Double Border
```html
<div style="border: 4px double #0F0; padding: 10px; margin: 10px 0; background: #000; color: #FFF;">
<strong style="color: #0F0;">AI Quote:</strong> $1
</div>
```

Effect: A double green border enclosing the text on a black background.

---

### 5. Rounded Border
```html
<div style="border: 2px solid #0F0; border-radius: 15px; padding: 10px; margin: 10px 0; background: #000; color: #FFF;">
<strong style="color: #0F0;">AI Quote:</strong> $1
</div>
```

Effect: A rounded green border around the black background for a softer look.

---

### 6. Inset Shadow Border
```html
<div style="padding: 10px; margin: 10px 0; background: #000; color: #FFF; border: 2px solid #0F0; box-shadow: inset 0 0 10px #0F0;">
<strong style="color: #0F0;">AI Quote:</strong> $1
</div>
```

Effect: A glowing inset shadow inside the border, giving a futuristic look.

---

### 7. Textured Border
```html
<div style="padding: 10px; margin: 10px 0; background: #000; color: #FFF; border: 3px groove #0F0;">
<strong style="color: #0F0;">AI Quote:</strong> $1
</div>
```

Effect: A 3D groove-style green border around the black background.

---

### How to Implement
1. Choose one of the above options.
2. Replace the Replacement section of your MyCode with the desired HTML and inline styles.
3. Save and test to see the effect in your forum.

Each option adds a unique aesthetic and highlights the "AI Quote" in an engaging way.